Vacuum-tube socket



Nov. 10, 1925- v.

' J. w. RADU VACUUM TUBE SOCKET Filed Nov. i920 To all whom, it may concern: 1 Be it known that I, JoHiv YV. RADU, a citizen of the, United States, residing at Patented Nov. 'l0,""'1 925;'

VUNITEDESTATLES PATIENT fornca;

JOHN w. mu, or NEW YORK, it. Y.,'.AssIeN0R .ro' wns'rnnn nrnc'rnrcoomrm,

mconrona'rnn, or NEW YORK, N.

'Y.,- A; conronarron or NEW YORK.

vacuum-roan socxn'r.

Application filed flovember 11, 1920. Serial 170. 423,244,

New York, in the county-of New York and State of New York, have invented certain new and useful Improvements in Vacuum- Tube Sockets, of which the following is a full. clear, concise, and exact description.

This invention relates to a socket for vacuum tubes and more particularly to a socket for vacuum tubes such as the audion in which a plurality of electrodes are arand the accompanyi ranged on the base of the tube and with which electrodes intimate connection must be made for the various circuits.

In'sockets for vacuum tubes it has heretofore been a common practice to attach all contact members-of the socket toone end thereof and arrange said members substantially parallel to'each other. Sucharrangement' allows the development of a consider-- able electro-static capacity between the various contact members. Such an electrostatic capacity between the contact members seriously impairs the efiiciency of a vacuum tube mounted in such socket regardless of the type of circuit in which the tube is employe An object of this invention is a socket which will be convenient for use and effective .in making such contacts as are required and in which the arrangement of the contact members is such that the electrostatic capacity betweenthem is reduced to a negligible factor.

The invention will be better understood by reference to the following specification drawing in which Fig. 1 shows a socket esigned according to this invention in combination with an audion. Fig. 2 shows a. view from below of the socket shown in Fig. 1.

Referring in. particular to Fig. 1, 10 rep resents a preferably rectangular base member composed of a single molded piece of insulating material, preferably that known The base member has in 11 from the bottom of which four 0 a ne 5 12 lead to the exterior of the base mem- 'ber.. The inner ends of these channels are arranged substantially radially of the opening through the base member and the'outer ends are preferably so directed that the channels emerge in pairs from opposite sides 17 and 18 which are of the same configuraof-thecontact members 16,17 and 18 extend of --the base member 10. Arran ed in the aforementioned opening and molded therein is a tubular member 13, preferably formed from a piece of seamless brass tubing in which is provided the bayonet slot 14. In the corners of 'thebase member 10' are molded tubular'elements 15 which project slightly above the surface of the base memher and which extend to the bottom of the channels 12 intermediate to the ends thereof. The elements 15 are threaded interiorly throughout their length for a purpose to be later described. Arranged, in the channels 12 are the spring contact members 16,

tion as the channels-12 and which are attached to the base by means of screws; 19 passing therethrough and engaging with the threads of the elements 15. The innerend's under the opening" in'the base and are arranged substantia 1y radially thereof. The terminals 20, 21 and 22 of said members 16, 17 and 18 are arranged at the corners of the square, the center of which coincides with the axis of the tubular member 13. The outer ends of the contact members 16, 17 and-18 are provided with apertures through which wires may be passed and soldered to said members to constitute a permanent connection. By means of screws 23 arranged in the upper ends of the elements 15 wires 7 may be temporarily attached to these elements. I

Arranged at "the corners of a square onthe base .24 of the vacuum tube 25 adapted to cooperate with this socket are rovided electrodes 26 which are electrically connected with the cathode 29 of the tube and electrode 27 which is in electrical connection with the control element 30 and the electrode 28 electrically connected with the anode v'31. These electrodes are' adapted to coo crate with? the contact members of the soc et to bring the cathode electrodes engagement with the terminals 20 of the contact member 16, the control element" electrode into engagement with the terminal 21 of'the contact member 17 and the anode electrode into attached at the other end, it is to be under stood that this arrangement may be varied as may be necessary. Also a pin 35' is provided on the base24 which pin engages with the slot 14 in the member 13 to hold the tube in the socket and the electrodes 26, 27 and 28 in position to be engaged by the terminals.

of the contact members.-

The base member 10 of the socket is sin-- gle piece of insulating material and is ormed by a molding operation. The tubular member 13 and the elements 15 are molded into the basemiember during the formation thereof. The molding of these ele' ments into the base member produces ,a practically integral structure in which the various metallic portions are completely 1nsulated from each other. The base itself be-- ing of insulating material obviates the use of insulating strips in the attaching of the contact members and the material of the base is sufliciently. strong to withstand the service to which it may be put.

The arrangement of the contact members on the socket and more especially where the contact members are arranged radially of the opening through the socket 'is such that they are spaced apart the maximum distance consistent with a compact and eflec-tive socketistructure thereby reducing to a practical minimum the electro-static capacity therebetween and allows the contact members to emerge in pairs from opposite ends of the base member of the socket and also gives to the contact members a highly efl'ective spring length. 1

What is claimed is: A vacuum tube socket comprising a base of insulating material a tubular socket member arising therefrom, 'a plurality of tubular members mounted in said base, a plurality of flat spring contact members, each of said contact members having one end projecting across one end of said socket member and the other end projecting beyond the edge ofthe JOHN W. RADU. 

